I am unable to download cv2, for whatever reason it does not work

Question

from collections import deque
from imutils.video import VideoStream
import numpy as np
import argparse
import cv2
import imutils
import time


ap = argparse.ArgumentParser()
ap.add_argument("-v", "--video",
    help="Users/ejr/Desktop/curry.mp4")
ap.add_argument("-b", "--buffer", type=int, default=64,
    help="max buffer size")
args = vars(ap.parse_args())
greenLower = (29, 86, 6)
greenUpper = (64, 255, 255)
pts = deque(maxlen=args["buffer"])
if not args.get("video", False):
    vs = VideoStream(src=0).start()
else:
    vs = cv2.VideoCapture(args["video"])
time.sleep(2.0)
while True:
    frame = vs.read()
    frame = frame[1] if args.get("video", False) else frame
    if frame is None:
        break
    frame = imutils.resize(frame, width=600)
    blurred = cv2.GaussianBlur(frame, (11, 11), 0)
    hsv = cv2.cvtColor(blurred, cv2.COLOR_BGR2HSV)
    mask = cv2.inRange(hsv, greenLower, greenUpper)
    mask = cv2.erode(mask, None, iterations=2)
    mask = cv2.dilate(mask, None, iterations=2)
    cnts = cv2.findContours(mask.copy(), cv2.RETR_EXTERNAL,
        cv2.CHAIN_APPROX_SIMPLE)
    cnts = imutils.grab_contours(cnts)
    center = None
    if len(cnts) > 0:
        c = max(cnts, key=cv2.contourArea)
        ((x, y), radius) = cv2.minEnclosingCircle(c)
        M = cv2.moments(c)
        center = (int(M["m10"] / M["m00"]), int(M["m01"] / M["m00"]))
        if radius > 10:
            cv2.circle(frame, (int(x), int(y)), int(radius),
                (0, 255, 255), 2)
            cv2.circle(frame, center, 5, (0, 0, 255), -1)
    pts.appendleft(center)
    for i in range(1, len(pts)):
        if pts[i - 1] is None or pts[i] is None:
            continue
        thickness = int(np.sqrt(args["buffer"] / float(i + 1)) * 2.5)
        cv2.line(frame, pts[i - 1], pts[i], (0, 0, 255), thickness)
    cv2.imshow("Frame", frame)
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break
if not args.get("video", False):
    vs.stop()
else:
    vs.release()
cv2.destroyAllWindows()

This is my code, I have no idea why I keep getting the cv2 there is no module error when I try to pip install it. (I am on a Mac, Python 3.7.4). I am wondering what is the import error here, has the version changed, do I need to use Python 2, or is there like a newer cv that I should use

Answer 1

Try:

pip install opencv-python

or

pip3.7 install opencv-python

I think you are running pip install cv2, which it does not exists since the project of cv2 is: https://pypi.org/project/opencv-python/